feat(rust) - Add "none" value for Rust feature "components"

src/rust/README.md

@@ -18,7 +18,7 @@ Installs Rust, common Rust utilities, and their required dependencies
 | version | Select or enter a version of Rust to install. | string | latest |
 | profile | Select a rustup install profile. | string | minimal |
 | targets | Optional comma separated list of additional Rust targets to install. | string | - |
-| components | Optional, comma separated list of Rust components to be installed | string | rust-analyzer,rust-src,rustfmt,clippy |
+| components | Optional, comma separated list of Rust components to be installed. Set to 'none' to install no components beyond the selected profile. | string | rust-analyzer,rust-src,rustfmt,clippy |
 
 ## Customizations
 

src/rust/devcontainer-feature.json

@@ -1,6 +1,6 @@
 {
     "id": "rust",
-    "version": "1.5.1",
+    "version": "1.6.0",
     "name": "Rust",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/rust",
     "description": "Installs Rust, common Rust utilities, and their required dependencies",
@@ -61,12 +61,13 @@
         "components": {
             "type": "string",
             "default": "rust-analyzer,rust-src,rustfmt,clippy",
-            "description": "Optional, comma separated list of Rust components to be installed",
+            "description": "Optional, comma separated list of Rust components to be installed. Set to 'none' to install no components beyond the selected profile.",
             "proposals": [
                 "rust-analyzer,rust-src,rustfmt,clippy",
                 "rust-analyzer,rust-src",
                 "rustfmt,clippy,rust-docs",
-                "llvm-tools-preview,rust-src,rustfmt"
+                "llvm-tools-preview,rust-src,rustfmt",
+                "none"
             ]
         }        
     },

src/rust/install.sh

@@ -10,7 +10,9 @@
 RUST_VERSION="${VERSION:-"latest"}"
 RUSTUP_PROFILE="${PROFILE:-"minimal"}"
 RUSTUP_TARGETS="${TARGETS:-""}"
-IFS=',' read -ra components <<< "${COMPONENTS:-rust-analyzer,rust-src,rustfmt,clippy}"
+# Set to "none" to install no components beyond the selected profile.
+RUSTUP_COMPONENTS="${COMPONENTS:-rust-analyzer,rust-src,rustfmt,clippy}"
+IFS=',' read -ra components <<< "${RUSTUP_COMPONENTS}"
 
 export CARGO_HOME="${CARGO_HOME:-"/usr/local/cargo"}"
 export RUSTUP_HOME="${RUSTUP_HOME:-"/usr/local/rustup"}"
@@ -396,19 +398,38 @@ if [ "${UPDATE_RUST}" = "true" ]; then
     echo "Updating Rust..."
     rustup update 2>&1
 fi
-# Install Rust components
-echo "Installing Rust components..."
+# Install Rust components (skip entirely when explicitly set to "none")
+# Trim each entry, drop empties, and track whether the "none" sentinel was requested.
+resolved_components=()
+components_none="false"
 for component in "${components[@]}"; do
-    # Trim leading and trailing whitespace
     component="${component#"${component%%[![:space:]]*}"}" && component="${component%"${component##*[![:space:]]}"}"
-    if [ -n "${component}" ]; then
+    if [ -z "${component}" ]; then
+        continue
+    fi
+    if [ "${component}" = "none" ]; then
+        components_none="true"
+    fi
+    resolved_components+=("${component}")
+done
+
+if [ "${components_none}" = "true" ] && [ "${#resolved_components[@]}" -gt 1 ]; then
+    echo "Error: 'none' cannot be combined with other components. Set 'components' to 'none' on its own to skip installing components." >&2
+    exit 1
+fi
+
+if [ "${components_none}" = "true" ]; then
+    echo "Skipping Rust components installation as 'components' is set to 'none'."
+else
+    echo "Installing Rust components..."
+    for component in "${resolved_components[@]}"; do
         echo "Installing Rust component: ${component}"
         if ! rustup component add "${component}" 2>&1; then
             echo "Warning: Failed to install component '${component}'. It may not be available for this toolchain." >&2
             exit 1
         fi
-    fi
-done
+    done
+fi
 
 if [ -n "${RUSTUP_TARGETS}" ]; then
     IFS=',' read -ra targets <<< "${RUSTUP_TARGETS}"

test/rust/rust_with_none_components.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Helper function to check component is NOT installed
+check_component_not_installed() {
+    local component=$1
+    if rustup component list | grep -q "${component}.*installed"; then
+        return 1  # Component is installed (failure)
+    else
+        return 0  # Component is not installed (success)
+    fi
+}
+
+# Definition specific tests
+check "cargo version" cargo --version
+check "rustc version" rustc --version
+check "correct rust version" rustup target list | grep aarch64-unknown-linux-gnu
+
+# When components is set to "none", none of the default components should be installed
+check "rust-analyzer not installed" check_component_not_installed "rust-analyzer"
+check "rust-src not installed" check_component_not_installed "rust-src"
+check "rustfmt not installed" check_component_not_installed "rustfmt"
+check "clippy not installed" check_component_not_installed "clippy"
+
+# Report result
+reportResults

test/rust/scenarios.json

@@ -64,6 +64,16 @@
                 "components": ""
             }
         }
+    },
+    "rust_with_none_components": {
+        "image": "ubuntu:noble",
+        "features": {
+            "rust": {
+                "version": "latest",
+                "targets": "aarch64-unknown-linux-gnu",
+                "components": "none"
+            }
+        }
     },    
     "rust_with_centos": {
         "image": "centos:centos7",